📦 Collection Sorter

Choose the right Java Collection for each scenario!

⭐ Score: 0
🎯 Level: 1/8
📋 Requirements
Store a list of usernames
    📊 How data will be stored:
    🗂️ Choose Collection
    📋
    ArrayList
    ordered duplicates indexed
    🔵
    HashSet
    unique unordered fast lookup
    🔗
    LinkedList
    ordered fast insert Queue/Deque
    🗺️
    HashMap
    key-value unique keys fast lookup
    🌳
    TreeSet
    unique sorted navigable
    🗄️
    TreeMap
    key-value sorted keys navigable
    ⏫
    PriorityQueue
    priority order heap-based
    📚
    Stack
    LIFO push/pop

    📦 Collection Sorter

    Learn when to use each Java Collection!


    Each challenge gives you requirements. Pick the best collection type for the job!

    List
    Ordered, allows duplicates
    Set
    Unique elements only
    Map
    Key-value pairs
    Queue
    FIFO processing
    Stack
    LIFO processing
    Sorted
    Maintains order